Fig. 3

a F2 intrafolial isoclinal fold (S-shape) in x–z and open folds (M-shape) in y–z within the series of “monotonous mica schists” (study area A/1). b Large-scale SE-vergent open fold in ortho- and metabasic gneisses of the Ötztal nappe. Note, early pinch-and-swell structures (arrow) occur incorporated in large-scale folds (study area A/2). Detail shows S–C fabric indicating NW-side-up displacement. c D4-extensional crenulation cleavage in mineralized phyllites (study area B/1). d SW-directed shear overprint in metapelites of the Seewertal valley (D4) (study area B/1). e M-shape intrafolial fold structure F2 within marbles in the Gaisberg valley (fold hinge area of the Schneeberg Main Synform). Note, folds occur in x–z and y–z sections (study area B/2). f S-shape intrafolial fold structure F2 includes earlier structures (D1) in garnet and hornblende porphyroblasts and -clasts. g Detail of (f). D1-related garnet porphroblast and hornblende aggregates with asymmetric pressure shadows. Sense of shearing is to the WNW (study area B/2). h D2-postdeformative growth of hornblende (study area B/2). i F2-intrafolial non-cylindrical fold structures in sections parallel and perpendicular to the direction of stretching (calcareous metabasites, study area D/2). j F3 open- to closely-spaced folds in retrogressed calcareous micaschists (study area D/2). k Detail in (m) shows F3 open folding. l S–C fabric south of the Lodner Synform (study area E). m Fold hinge area of the marble synform shows F2/F3 fold interference and S4 foliation. n Closely spaced crenulation folds south of the Lodner Synform (study area E). o S4 within paragneisses at study area F. Direction of shear overprint is to the SSW